最好预先警告用户可能出现触电。
It's best to warn the reader about the potential electric shock in advance.
youdao
大家都得到了预先警告，必须尽快采取行动，“他说。”
We have been given fair warning and must act soon, "he said."
这是一个预先警告。
There is one caveat.
“我的主，”他说，“已经预先警告过我。”
My Master, he says, has forewarned me.
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